The pistol, and especially the 9 x 19 mm cartridge for it, designed by George Luger and adopted by the German army in 1908.

Parallax

Parallax is the apparent position of the reticle on the target image at different ranges.

Peep Sight

A type of gunsight, mounted towards the rear of a rifle through which one simply looks, placing the front sight on the target.

Pistol

A pistol is a usually small, projectile weapon, normally fired with one hand, for personal use in short-range action. There are three main varieties of pistols: automatic, semi-automatic or single-shot hunting or target pistols. Automatic and Semi-Automatic pistols use the recoil or gas energy of each round to cycle the action, extract the spent case, and load the next cartridge. Single-shot pistols are loaded manually via the breech, either from a small magazine or by hand.

Pistol Grip (PG)

Full Pistol Grip, is the portion gun that is held by the hand and orients the hand in a forward, vertical orientation, similar to the position one would take with a conventional pistol.

Ported

Small holes in the barrel of a gas-operated firearm through which expanding gases escapes.

Power

The power of the scope is the same as magnification.

Primer

A small capsule of soft metal containing a detonating compound, press-fitted into the head of a cartridge.

Pump Action

A rifle or shotgun action in which operation is by backward and forward movement of the gun's forearm; also called slide action.